> Clearly that seller is getting some benefit for selling the product through Amazon, probably close to 20-40% of the value of their product if they didn't. Or

> Clearly that seller is getting some benefit for selling the product through Amazon, probably close to 20-40% of the value of their product if they didn't. Or the small pool of people who refuse to use amazon are willing to pay 40% extra out of principle, and the seller is happy to exploit this behaviour while it lasts.